Operating mechanism for sewing machines



Dec. 16, 1930. s.- F STEIN 2 OPERATING MECHANI'SM FOR SEWING MACHINESOriginal Filed March 15, 1917 3 Sheets-Sheet I Dec. 16, 1930. s. F.STEIN 1,785,462

OPERATING MECHANISM FOR SEWING MACHINES Original Filed March 15 1917 3Sheets$heet 2 0 3756, f /mfiz 81mm 11 foz Dec. 16, 1930.- s. F. STEIN 13 OPERATING MECHANISM FOR SEWING MACHINES 7 Original Filed March 15 19173 Sheet -Sheet, 3

" SAMUEL F STEIN; on w ilmz visponn ni\TsYLvANIA N SM nssw mcmms. j

TA pucatimi-meanaiipfiflefi,serialnagfiaobv;fnnew am ;1 24. 5]? j inintion'i'elates to thevdriiringniecha pa rtl y -infseetionofTajdo1iblel.s1ack ad+ 7 nism ofsewing machines, and in: particulap. uster,prov ded with a slackl measur ng ed eis to=power driving mechanlsm,such as emylce; Y r

ploy'e'din memesnufac ring;and other" Yl-Figi11is anend eievatioh 5faslacii a Q5 plants whereaiganghr series of machines jn ster that imeunt dpii thearin oii the sews 5'5 are-drivenhfrom the's'aineshaft',and generally ing machine; statedtheobjectiof myinvention'iStOiaVbid fFig. 12 loss of timeff on the stoppage o f the Inaa- Figrll 1chines foradjusting, orfreplacing.s1ack, or, Fig,13"1s;-an=elevationshowing another,

brokenihelts and; to rendei'nnnecessary'any consti'uction' ofslackadjuster applied to the 60' a section ontheline p pl c n p at s r'n, n: s i g a n ar I 7 nection with itunning shaftg or?othenmeim T.Fig.l4 isja. transversesectionof a sewingc c bers' where great danger'ofinjuryvexis'ts-and ma-chinegpowerfltable. embodying'my. in en-I @for theattainment ofsi1' c]r 1 object and to 'seition iniwhich. the poweristransniittedjdicureotheradvantageswhich willhe apparent ljectlyIfrointhe inain shaft pulleyto the sewi snhstantiallyi illustratingo 'wayhy' which an additional when the emhodiinentsof my inventionhereing machine pulleys instead oiithi ongh the inafter: set forth indetail illustrated in intermediary ,ofthetrans nitters and {which Iaccompanyingfdl awings are understood; in the case of Fig'ill ig isapplied directly to g my in viention consijstsinf-the constiuction thesewing machine shafmw- I V Y hiteinafter specified and F ig; 15' is adetailyiew pa-I fly in side ele I Vation and partly infvertical sectionofahelt slack-adjuster} with indicatordevice that I g 'o'yj Whichindicatesthe'cond-ition of y In oconlpanj ing a i L p pla n v ew, withportions may ernp broken:away showingjasewing machine the beltsy i H a av a.

power .table construction embodying my in TFig- 16 is a horizontalsection onftheiline 75 V Fig; Q-i tiinSv i' ti ngther fwi th :Fig' 17 isafdetail rview in section similar part'siin elevation to EigJ-B andshowing another form-of belt ig. Qais a section'on-line SlLOk;adjUSi'/8fand: indicator. 5 Q F ig. 3'isla det ail iview inside. eleiz'ation of iferringto the drawings. Ishow a double 30 a portion ofsnch a powertable, hut illuspower table of ordinary construction,itcomtratingjdiflerent location of the, driving prisingcast-iron'supporting legs lOandtwo 1 shaft fr'om that shown inFigs. ".1211 11 12; alin-ing parallel series of table tops 11, each.

i 7 FigsA and 5, re, respective1y,detai1 views adaptedto support asewing machine 12 and I having a-Inain driving shaft 13 runninglonpulley may be applied to 'thesewingl'niai gitudinally of the seriestables and situghine shaft; I t V v ate'd' hetween thetwo series oftables and he- Fig. 6 is adetail View inside elevation with in'g drivencontinuously by power. appli d to parts in section showing a formofslackadahand wheel 14 at one end thereof; For

40 jnster of my invention that rinay be em-y each sewing machine there,isa treadle conployed' i ,j .fll: 1 trolled {transmitter through whichpower. c

,Fig. lisa similar View showingafdi'ifei ent from the'continnouslyrnnning dri'vingshaft form of slack a'djus'ter 1 f l3 may'be transmittedat the will of the op 1 -is a hoi'iz ontaljs'ection on theiin'e eratoitothe sewingmachine, and inthe usual 45. 7' 7 f Fi 7;f' I i l T 1 I if]practice itherelis a p nlley for each sewing 5?- 1g. 8 is adetailview invertical isection cmachine on the'drivingshaftl'13be1tedfto'a ofyet-another forin of'slack adjuster; pulley on the transrnittenand-thereis a sec- Fig. 9 is a honizontalfsection'on the line iond pulley'on thetransmitter belted toa pul- Q Qof'Fig; 8; I ;f leylori the sewingmachine shaft adjacentthe Fig. 10 is'a View partly in sideelevationf Tea7 construction when aloelt becomesslaclr, worlr on that machine mustbestopped and the slack condition remedied by cutting out the surplusportion ofthe belt and replacing it. Usually there is a mechanic whoseduty it is to look c after such matters, and he, of course,

maybe busy elsewhere, thusprolonging the a exposed t an er Q.. 1; -.In,ttms: v the belt to remove the excess slack portion, too

' disusefof the-machineQa-nd he must do the I work "of. replacing whilethe "main driving shaft and its pulleys are revolving, and thus jmuchmaybe removed.ifiAgain,' awbelt may a break and great effort will havetobe expendedto place the belt on the pulley,- which 1 1 n ea e th pr bb tyl Of getting a g t wijth th'e revolving PulIeyJandlshaft even afterthe belt has finally been placed on pulley on account of its tightnessitis liable than one,. and preferably mo're'than one' in c" r fn t anymm n d encer new belt; will be required, and invol e; the same Iconsequencesas to disuseof 'tl esewing;ma I chine and danger insupplying tlie belt.f In

stead of using a single belt to transmit power from main shaft to;transmitter: and 3 from.

transmitter to sewing machine,I use more i each case. Thu's,.' as shown?in thef drawings,

a "a ria time Pull Y' t-h two grooves, "or two grooved pane s g s and15. side by sideian'd' provide two pulleys 16 andi6 'si'debysidefonthe'j transmitter, thus providing "two pairs of pulleys, l5-and16 be}- ing one pair and and 16 another pair,

and each pairbeingcOnnejcted by its own belt 117 or 1' and I alsoplac'e-fon thetransmitter 1 1 two pulleys 1'8 and IS side sideand uponthe-sewing machineshaft twolpulleys 19 and w saaeby stamens providing o'e r pulleys from'the transmitter to thesewing machine shaft, and eachpair:havingiits iown driving belt, 20 or'QOi If Qneof thebeltsIfZO and20 breaks, or. becomes too slackjto drive,

' the sewing machine will i everthelessnot he stopped becausetlie'remaining-beltLwill contm'ue n operatlon and the slack,loir brokenbelt can bd'attended j to at some convenient time when'the machine isnotin use andshaft L if that one should break, I I g the loose pulleywould be shifted togthe fast pulleynnd thus; become th'edriviiig' beltnot revolving, as, for example, at'theend, or beforetheT-beginningbffthe days work: Moreover, my employment of a pluralityofbelts, by reason or the division of labor between them adds to'theirworking longevity.

If desirechby usinga 'fastan'd loose'pulley' arrangement, both beltsneed not be used to transmit power'atthe same time, but only one whichwould work on the'iast pulley, and "then the other on .g The transmittenGee-meat connect 1 power to-thesewing machine,- as .usualby aneedle2l,'whic h through a connectin rod, or'linlr 22 rocks a lever'23 whichpresses the} set Of' l 31 11 ii-1 0 eng gemen Wil the set of wheels 18and 18?; when the treadle is released a spring 24 efiectsthedisengagement of such wheels. The lever 23 hasa brake finger 25 which ismoved intoand out of contact withthe'rim of one of the pulleys to stopand releasethe latter.

To employthe. dditionalbelt as far as the merely Ltoa'dd a" second"pulley, on the band *whe el'isha-ft alongside the pulley already pro-'vided, as'illustrated' Figs, 4: and 5, sothat no'fs'pecial constructionof the sewing machine inthat regard 'ls necessary and machinesalready'constructed may be utilized. Thus as shown in Fig.4,the-additional pulley 190 may he slipped over-andsecured by screws tothehiibjordinarily present on the sewing machine wheel; flhe fastening,screws can be run radially,1as shown :in Fig. a, or attaching meansotherwise: applied may be employed, The "additional; pulley...

5 l he-main. driving shaft13, ma fas' in ordi' sewing'machinejis'concerned, it is-necessary a e5: V rthe' transmitter j-'ma-y'he-similarly provided.

naryjpractice,-he' supported fronfthe floor by bearing-floracket's26,"asshown in Fig. 3,.but an important feature "of my"invention, as shownfin'Figs. 1 and 2,'is;the location of said are not safeguarded;Saidtrough best hew l yF IQ1 i5F Mur ia tom' and sideswhich extendfrointhe under: side of I the; table top to; the bottom, and the shafthaiigersfor' brackets 28 may, bereadily supported fromthe' tablelegsbelow the' botmm; a suitable opiiing beingjpr vide(151at e i he e e nt et g'h of h hen s n r -j al s pt ssary, f

the: purpose of invention, that there-be a bottom "toflth'e 'trou'gh;.:See Fig. 14; "The cover that may consist, as best' shown in 1310f stmle y; c j fi d s cti 2. reaching between oppositetables and hingedsections iiosituated directly above the p111 leys 1 5 onthe drivingshaft, the hinged sections. beingprovided to give access to thepulleys-for" the "application of the belts there? to, ortighteningpulleys to the shaft. said jup'pe'r' side '"of'theil trough 27isiclosedby a hinged sections'are-hinged on'an axisextendposit'esewingimachine.operators; T11e sta-' t o ry. Sec ion imay' T ib iu di othread s'tandsfor' put-to" any other desired use, Said eaway. swip s-awbe em t tel iiing transversely "of the "tableifso'that when h wimme s thow open, or raised they awmemwed-toward the sewing machines,

R V and; hence, involve no disturbanceof the opdirectly above theoil-:holeof the bearing be1-- V and kept in a conical holein the-tabletop sired," in which, case there will be 'vertit zz il. walls-orpartitions at the ends of the hinged sections. The location of the"driving shaft in the trough renders the oiling ot bearin'gs thereof veryconvenient becausesthe bearings bein close tolthe'top of thetroughaiioilhole may be provided in the stationary section 29 low so that theoilmay-be suppliecl'from the top of the table, asbylan ordinaryioil can.

with along nozzle, or an oil can"-29 placed an inverted "positionsof'that "oil; may i drip therefrom to thebearing. r 5

Another important feature ofmy invention is the provision of a devicefor takingup the slack of the belts from the main driving shaft to thetransmitter and from thelatter tot-he sewing machine shaft, or inthe'casebf either of such belts I illustrate-in the drawings variousforms ofslack adjusters applicable to both sets of belts. 7 .Those shownin detailin Figs. 6 to lO'are applied to the sewing machine table andinclude a belt-engaging roll-v Jer or rollers located beneath the sewingma chine table and a rolleracarrying arm; or shank passing through anopening in theta ble top and extending tothe upper side thereofwhere itis provided with means for ma-;

nipula-ting, or adjusting itto move'theposition of the roller to take upthe belt slack.

' In such cases the slack ad'juster is mounted upon the hingedfcoverslBO and thebelt-en gaging rollers bear-"upon the-upper side ofthe belts so that thehinged cOvers 3O-may be readily opened.- 4 In thedevicefshowninFig;

6, therefis a single belt-engaging roller 32ijou'rnaled a vertical screw35 that engages thread-like" notches36 in the adjacent side oftheshank-33 so that by revolving-the screw 35 the shankand roller mayibeadjusted and this adjusting deviceis obviously'selflocking. The shank 33mayfhavel 'graduations' 33a-cooperating with the top, surface'of the boxwhich are so related to the tantyor tight condition of the belt andchanges therefrom toindicate in :inches the amount of slack required tobe removed. 7 Thus the mechanic or workman may havean accuratemeasure ofthe quantity of the belt'to be cut cutand 5 thereby avoidthe dangeroffcuttingto-o and ruining the belt. g

The'sla ck adjuster shownin Fig. 7 n; sists'of a vertically movableshank '37 which below the table hasa horizontalpintle in the 9 form ofabolt38 secured to such shank upon which pintle is an idler. roller39gforj each belt andjthe rollers are loose'on the'boltsis'o I maketheslack adjuster automatic.

that they -ma-y*moveflaxially to compensate fora'nyinaccura'cy intheattaching,ormount'- ing-of the shank "37 onthe table. Above the table;the shank 37 passes through a' box 405' and a setscrew 4:1" is providedfo'r clamping thesha iik37, at the desired point of adjustment, thescrew engaged fsurfacejof the sh'ank beingfiattened so asio; preventturning" of "1111 Fig; '8I show a that" is automatic; it 1 having aroller-carryibl ajd slack ad -tau ing" shank 42;w'hieh {extend above thetable tQP intoa sleeve is b ased armejw sya screw'plu'g' 5L4andbetweenwhichrfplug'and shank'LZ is interposed a coil'spring 45 which,m y-acts'to press the shank 5t21'in the di sclf V recti'on to cause thebelt actd hrebn to be tightened. [Thescrew plug employedso a 7 that thetension of the spring 45'may bead-j provided" to prevent. turningthereofj' and V juste'd; As the shank 42 is roundymeans .are-

ma ph B meti ft b t i ae l e er, which aszshown, consists ofazradiahlug,

or pin 6 thatengages'aslct t'l-in thesleeve $31; LAs shownin Fig. 10,,theiishank48 which" Carries V the belt-engaging. roller; or device,

has its portion abovethe table; top threadedffi; and engaged'by a nut 49swivel'ed infia box" 50fso that byrevolving the nut, the shank 48 ismoved longitudinallyand above the boa i 50g Atth eupperendoftheshank-there is. V 5

a'lug 51 which points in the" same direction in whichythebelt {eng gingroller; is

lie, so. tha tthe operator can see eXa'ctlyiw atthe jrelativepositiojnof: the rolleristo the belt engaged. The slackof thebeltZOjrunningQto I,the sewing machine shaft may be taken up by the deviceshown in F ig. 1;0said device com? prising abeltsengagingjrollerf52i'carried, by c I anarm 53' hinged tothe base-" pl ateoffthe box 50, and which arm 53carries a clamping screw '54 which passes through an .arcuate slot 55 inan arm 56=and therebyflthe roller 52 secured at the desired adjustment;As in lthe case of the device shown in Figffi; a scale,

tor compi isinga scale 57 on the a rm 56 and van index,- or pointer 58on the arm 53 which coactswithsaid scale; A spring 56abe provided topress on the arm 53 so as to Asshown in Figs; 11 and 12, the slackadwhich case it consists of abelt-engaging roller 59 carried' an arm 60adapted tofbe "secured at the desired pointliof adjustment "by aclamping screw 61, whichpasses through a slot 62 in the 'arm and intothe adjacent wall of the arm of thesewing machine. Adjust: ment'mayj bedoneby slidingthe arm length- Wise,'dueftothefslotyior by rocking thearm7 60 on the screw asja pivot.

fAs-shown in Fig 13; there is'a lever63 piv 01 indicator is provided tomeasure-the amount of slack to be removed, sa d injdicae juster is shownapplied to the belt 20 running tothesewing machine shaftpul'ley, in

- t o t s wi g ma naz rm:b tvie fl ts 1 ends which-carrieslon eachjlsideotIits-pivot CPI a belt-engaging roller 4 64 so; both runs o he. beltare ng e b I a mil e and a spring lfiiis provided thatbears upon saidlever and auto natically rnoves the lever in t'he 'direction-to takeuptheslack The pivot of said lever is preferably clamp screw '66so'thatif desired the lever may begclanlped' 1 to the position towhichit may be moved, in

which caseits' automatic action will not be j iitiliz edtgThe positionof thespring 5 is such "that. should the belt break "and'the leverv 63swunggbythereaction froIn the breaking of thefbeltfthe spring will stopthe swing of 1 the levees, and.thus:p v any r ab y of striking'theloperator. shown. in Figs. 2 and 2 a]siniilar device is employedconsisting of a leverfGSQwith rollers 640 and 641 on opposite sides-toje-ngage diflerentbelts. The pivot screw 65,0 passes through a slot 651finQthe lever, so that-,by shifting' the lever lengthwise and alsoturning'ifl the 'desired'tenr sion may be put onneither b terferencewith the other. f

elt without in- QIt is preferable inorder to fallow the play ofthe;be1ts inftjakingflup slack to cut j 's lots for the passage pfthe.beltsz. t-hrough the table tops3or walls. and on? the fouterfside ortop' isnllf lcgbf thv it lblettoiface gthes e slots with slotted inetalplates 68, .as shown in Fig. 7

shown. in' Fig. -1 in dotted lines the tableinay. have a leaf, orextension '69toforIn a guard for the mai 11* shattjdriving, wheel l l,

the location of the shaft '13 'in'the" 1 trloughfifi, the belts running;from the pulleys" on suchshaft are invisib'le, andghencefltheircondition as to sicknessis no: fope'n to (view.

I, therefore, propose, tousel an indicator with afslack' adjuster whichwilldis'close the state of such belts. As shown inEigTlS I e ploy avertical bar 70- which extends a o e and be low the table topthroughfahole' therein and throughia boxfi fastenedto the top r the"bears uponthe adj acentbelt table, and which through: one offitswallshas attached a clainpingscrew 72 by which the vertical position'oftliebar 7Q, rnay'be .fixed atl difierent vertical adjustm nt andpivoted to the lower endof SaiCl b ZLlf- 'ZO 011' opposite sidesthereotare two angle'levers '73 the short arni of each ofwhieh carries'arjoll'er that V 75, 9; 75a while the long arm of the lever extendsvertically {one on each side'of thebar 70)Iaxidterrninates atits upperend inan index, or pointer {76 that preferably. proj ects. a shortdistance above the'ltop of thebar, 70.; YA; spring 77 pressing; againstthe longenarm of the lever 7E3yieldingly forces'its-roller 'ZiL againstthe belt. It 7 will thus be seen othat change in tension offthe belt-75"will gau e tliepointer 76 to swing overa sca leof marksliaving suitablecharacters to -indicate; the 1 different de grees of tension, Ont-hecondition of thebelt;

11 3 5 the .let a fl ne ts't iedi eiedi a h t h bs ii t s so a w l he pi r 76isadjaeent the letter -fT itis known the bell? i p o d tion, theletter' lnay beused to indicate an-objecticmably loose Condition towhich the"pointer points when thatf condition exists; and the letter ,Omay 7 be used to indicate that the belt is off and to .which-letterthe;.pointer swings when the roller 74' is not in contact-3 with. thebelt 75. A stop pin -7 8,-projects on both sides of the barjOintheipathof the longindicator arms o the ve fizt dstopsth m hentheyre I in. th atlimit; of their; swing which indicates that the belt is properlytightwhilepermitting; them free n ove nentin the opposite with an outwardlyprojectinglug 8Q..fitting a vertical slotq81 in sleeveg825and each ofsa1d lugs constitut ng an andic'atori to! cooperate with a serlesot indcators-consisting serveto indicate.the stateofztension,-.or con ditionotthe-belt. On top and'botto not the 7 table therefare' washersg orplates .83 ;pro-

vil with ca m ho s; fo he ie pe t e shanks 79a.,..; vz

si n ted in F gs-' a ,3 Spa providedin consequence of lifting the shaft13 an k i l pul ys .lpl'a' el et ng P p s 8 .the same being .supportedin holes provided i z ab le sior he pn pase- :T the he ating pipes aregiven a location where-they a out of e-w sted ye reimo ted ntageouslylocated for heating nrposes, and if desired to protect surfaces '21ove'themg' froni siv ea s ch il -fa s may be e' v-e d with-asbestos, .7

tion. as embodied in a: vpower; table-v for sewe ingfmachines where thetransmitter 85, is

ted-d e tly fir n e sew g J hi l be 17 f om: th dri ing Pell ys 1 1; e VmainshaftlSlgtothe transmitter,- said belts 86 b eingpassed over idlerpulleysl87 to change theirgdirection and the belts 86 ony-one; side ofthetable being crossed togive the proper direction of revolution toa-thetransmitter.

The transmitter shownis of known construetion having a pulley shiftinglever88, and in i lieu oi the usual friction-brake armlthereon I providea finger l 89, adapted to actas-a positive stop by engaging a projection9Q on the hand wheel 91 ofthernachines0 thatthe sewing machine needlewillalways stoplin a desired position, either out of" the goods .or'

inthem.) Two projections 90 may be used,

to stop the needle in either position; but one o .w ihismfiv at t ee r,in Pla to as h wni ensme h -e eel ee lr hifisite Q2? 3 cupy eitherposition. Insewing shortpieces such as flaps, buckle-straps, etc.,where; sharp turns or change of direction of the hue of stitching isrequired,- such turns canadvan tageously and readily be made by usingthe needle as a pivot, when it isstopped down in the goods. On the'sideof the finger 89-to ward which the projection 90 moves, 1 provide aspring 92, over which the PTQJeCtlOII rides before it is arrested by thefinger. This cushions the blow of the"pro]ection, and it also enablesthehand wheel '91 to be readily turned backward, as might be necessary forlifting the needle, as when thesewing thread breaks and'the'needlev isin the goods. ISaid' proj ection 90 is' preferably a roller of suitablematerial, so as to rideeasily and n'oiselessly.

The transmitter lever 88 is acted upon by a spring 88"; so thetransmitter is normally inactive, and movement of the lever to renderthe transmitter active is, as usual,eifected by a treadle. Upon releaseof the treadle, the

lever 88 swings and putsits stop finger 89 in" the pathof the projection90. The partsare so arranged and timed that the finger 89 is 1 moved outof the path of the projection 90,

at or just before the lever 88-acts to throw on the power to themachine, when the latter is I to be started up. 1

' As shown in Fig. 1, the maindrivingf'pulley 14 may be provided withtwo belts 93alongside of each other, andfwhi'ch may be ,sepa- 3 rated bya flange 94 at the middle of the face of the pulley, the two beltsbeingprovided on the same principle of the .multiplication of the beltsconnecting the driving shaft and the sewing machines. V The locationQftheshaft' 13. near-thetop of the table is of great advantage inthatthe workman has access thereto'and' the pulleys.

: and belts thereonlfrom the top,sothat awk while putting theboltsthroughqthe frame ward tiresome bending over of the body is, 5

unnecessary 1 and, hence, comfort as well as safety of the workman'isassured, and no disturbance is caused ofthe sewing machine I operatorwhlle at work.

When the transmitter'sframe istbolted to the underside of the table asshown in} Fig. '2. of the drawing it is an' awkwardj ob, to hold theframe in position becauselof its weight into the underside; ofthe tabletop. L therefore, provideonsaidtransmitter-frame 95 a .vertical flange.96 whichi abutsiagainst the outer edge of the tabletopangd'throughwhich .tor with Of course,

As shown inEigsJf 2 and 14, a guard, or shield in the-form of'a plate 99may be provided as a safeguard against'contact of operathe pulleys andbelts adjacent thereto.

pulleys and the form of the pulleys. may be varied without departurefrom my invention; Having thus described. my inventionwhat 1 Iclaimis I1 an improvementin'power mechanism for sewlngniaehlnes, the combinationofa v dilVlIlgSllEtft, a plurality of pulleys thereon, I

a plurality of pulleys through which power is transmitted to the'samesewing machine, 7 and belts'conuectmg the drivlng and driven .pulleysinpairs each belt alone beingable 1 to transmit the'required driving,power.

2. Asan improvement, in power mechanism for sewingmachines, thecombination of a driving shaft, a plurality ofpulleys'thereon,

a transmitter comprising-*a corresponding,

therelative dimensions of'the 71 number of driven pulleys, beltsconnecting thedriving and driven pulleys inpairs each belt alone beingable to transmit'therequired driving power, and means for transmittingpower from the transmitter to "the sewing machineqf 3. As an improvementin power mechanism for sewing machines, the combinationof adrivingsl1aft,'a plurality of pulleys thereon, a transmitter comprising "acorresponding nuinber-j of driven pu lleys, belts connecting the'drivingand. driven pu'lleys in pairs each belt alone" beingable to-transmittherequired driving power, and meanslqfor transmitting."

power-from the transmitter/to [the sewing machine, alsorcomprising apluralityofdriving pulleysand driven pulleys on theisewing m achine'shaft and belts connectingthemf lnwpalrs'r, 1 r

- 4. As animprovement in power mechanism" for sewing machines, thecombination'of drivingshaft,'-means for transmitting power fromthef'shaftto the sewing machine, coming'device'for the belt, and meansassociated .i 1107 V prislng-belt connected pulleys, a slack adjust- Vwith said. slack adjustingydevice to measurethe amount of slack. V t a V5 As an improvement in power mechanism for. sewing machines,the'combination of a ,Intestimony whereof Iaflix my signature i L eM-UETEIN- bolts 98 from the undersideiwhich-enter the mitter framein-iposition. o

vunderside of the tabletop, which bolts 98 are '1' ff. v the onesdepended upon to support the transg driving shaft, meansfor'transmitting power from the'. shaft to the sewing -macl'iine,comjprisin'gbelt connected pulleys, a slack ad'- justingdevice for the belt,and means a's'so-, *ciated with said'slack adjusting devicetojj iaethestate.of-the belt; a

